Dressing attachment for grinding machines



Oct. 21 1924.

C. KNOWLES DRESSING ATTACHMENT FOR GRINDING MACHINES Filed June 20. 1921Swoon-)Coz Patente ct. 2i, Wd..

UNITED STTES PATENT CARROLL KNOWLES, 0F HARTFORD, CONNECTICUT, ASSIGNOR,TO PRATT & WHITNEY COMPANY, O'F NEW YORK, N. Y., A CORPORATION 0F NEWJERSEY.

DRESSING TTACHMENT FOR GRINDING MACHINES.

Application iled June 20, 1921.

To all whom t may concern:

Be it known that I, CARROLL .KNowLEs, a citizen of the United States,residing at Hartford, in the county of Hartford and State ofConnecticut, have invented certain new and useful Im rovements inDressing Attachments for rinding Machines, of which the following is aspecification.

This invention relates to dressing attachments for a grinding orabrasive wheel and in particular to dressing attachments for a grindingwheel which is adapted to contact with the work on one of its lateralsurfaces.

One of the objects of the present invention is to provide devices todress two surfaces of an abrasive wheel, one of the surfaces being thatwhich engages the work and the other surface one at an angle to thefirst surface. One of the features of the invention is to accuratelydress ott' a lateral work-engaging surface of an abrasive wheel topresent a new and clean surface to the work, and also to dress off theouter periphery of the wheel so that the lateral work-engaging surfaceis accurate and true up to the outer periphery of the wheel.

Another feature of the invention that is advantageous is that the axesof the dressing attachments are in fixed position, and at right anglesto each other, one being normal to the axis about which the abrasivewheel rotates and the other one parallel to the wheel axis. Stillanother feature of the invention is that the dressing attachments areapplied directlyto parts of the wheel mounting and in positions so thatthey may be readil placed in operative position or removedi With theseand other objects in view, my invention consists in the features ofconstruction and operation set forth in the following specification andillustrated in the accompanying drawing.

ln the accompanying drawing annexed hereto and forming a part of thisspecification, I have shown my invention embodied in a dressingattachment for a cutter grinding machine but it will be understood thatthe drawing is not to be construed as deining or limiting the scope ofthe invention, the claims appended to this specification being reliedupon for that purpose,

Serial No. 479,030.

i ln the drawing:

Figure l shows a front elevation partly in section of a grinding wheelwith the dressing attachments in position for operation.

Fig. 2 is a side elevation in section with the wheel partly broken awayto more clearly show some of the parts.

Briefly, my invent-ion in its broadest aspect comprises: first, adressin, attachment which may be mounted on a xed part of the grindingmachine in a position to dress off the outer periphery of the wheel;'and second, a dressing attachment adapted to be mounted in fixedposition relative to the grinding machine to dress off one of thework-engaging lateral surfaces of the grinding wheel.

Referring more in detail to the figures of the drawing, at 10 is shown agrindin or abrasive wheel mounted at the forwar end of a spindle ll. Thespindle 1l is r0- tatably mounted in bearings 12 provided in a wheelhead 13. At 14 is shown a pulley by means of which the spindle 11 andthe wheel l() ma be rotated. Surrounding the wheel 10 and7 enclosing aportion of its periphery is a housing 18 which may be formed as a partof the wheel head 13 or may be secured in any convenient way to thewheel head 13.

The upper portion of the housing 18 is formed into a vertical projection20 and is preferably bored therethrough as shown at 22. This projection2() forms the support and also the positioning means for oneof thedressing attachments which will now be described. As shown in F ig. l,the axis of this bore 22 is normal to the axis of the wheel.

A sleeve 30 adapted to be fitted within the hole 22 bored in theprojection 20 is provided with a bushing 32 through which eX- tends arod 34, which, at its lower end, is enlarged `in diameter as shown at35. The lower end of the 10d 34 is provided With a head 36 preferablyformed integrally with the rod 34.. Eccentrically mounted within thehead 36 and depending from its lower surface is a dressing tool. In thepresent instance this takes the form of a diamond 39 mounted in a shortsleeve 40 suitably fastened into the head 36. in order to aotuate therod 34 and consequently to oscillate the diamond 39 across 'theperiphery of the Wheel 10, a handle 42 is made fast to the bushing 32 atits upper end so that oscillation of `handle 42 oscillates the diamondy39 simultaneously therewith.

As shown in Fig. 2, the handle 42 is inserted in a collar 44 surroundingthe sleeve 32, the collar 44 being fastened to the sleeve 32 by means ofa pointed screw 46 threaded into the collar 44 and engaging a depressionin the bushing 32.

The rod 34 and consequently the diamond 39 is moved with oscillationsof, the handle 42 and bushing 32 by means of akey 48 in serted in part35 of rod 34 and engaging a lon itudinal spline 49 formed in the innersurIae/e of the bushing 32. The rod 34 therefore turns with the bushing32 but may move longitudinally relative thereto.

In order to adjust the diamond 39 vertically Within bushing 32, in adirection parallel to the sleeve 30, a screw 50 having a knurled head 52is provided surrounding the u per end of the rod 34 and threaded intodie bushing or sleeve 32. Rotation of the screw 50 by means of the head52 forces the 4diamond 39 further from the lower end of the bushing 32.Surrounding the head 52 are suitable graduations 54 so that with the aidof the scale 56 mounted on the upper surface of collar 44 the adjustmentof the diamond may be readily determined.

The rod 34 is provided with a small collar 60- suitably fastened inplace as by means of a pin 62. Against this collar 60 a spring 64enclosed within the bushing 32 continually presses, thus forcing theJrod 34 upward relative to bushing 32. By means of this spring the rod 34is held up against the adjusting screw 50. As the collar 60 must befastened to the rod 34 after the rod 34 and spring64 are placed inposition a transverse hole is bored through the sleeve 32 as-shown at63. This permits the pin 62 to be driven in place after the spring 64and collar 60 have been placed in position.

In dressing off the periphery of the wheel 10 the sleeve 30 is firstinserted within the projection 20 and is moved downward until thediamond 39 is almost in contact with the outer periphery of the wheel.At that oint a collar 61 is positioned in contact with) the uppersurface of the projection 20 and is fastened in adjusted position on'the sleeve 3() by means of the screw 65. The collar 61 may then be leftin adjusted position and not changed until the outer surface of theabrasive wheel 10 has worn sufficiently to require the sleeve 30 to befed downward beyond the range of adjustment of the screw 50.

Vith the sleeve 30 thus located the rod 34 and diamond 39 are moveddownward by rotation of the screw 50. Then, with the diamond 39 inadjusted position, oscillation of the handle 42 will canse the diamondto transverse the entire width of the outer periphery of the wheel 10,thus resurfacmg this part of the wheel.

In order to temporarily hold the sleeve 30 in adjusted position and toprevent vibration, a screw 66 is provided in the projection 20 and maybe tightened about the sleeve 30. I preferably also provide a spline 67cut into and extending the entire length of the sleeve 30 so that thesleeve 30 wlll always be placed in its correct position rela-tive to thewheel 10 and the diamond will properly traverse the entire outerperiphery ot the wheel 10. This spline 67 is engaged by the inner end ofscrew 66. To remove the attachment. fromits operative position it isonly necessary to loosen the screw 66 and withdraw the sleeve 30 andwith its component parts from the projection 20.

Coming now to a description of the dressing attachment for the lateralwork-enga ing surface of the wheel 10, this attac ment comprises a bar1.00 on which is mounted an arm 102. The bar 100 also has n. positioningcollar 103 which may be fastened thereto by a pin 101. As shown in Fi 1,the axis of bar 100 lies normal to the p ane of the wheel 10 and alsonormal to the axis of sleeve 30.

This attachment is adapted to be mounted on suitable projections 104provided adj acent thel grinding wheel 10 on the wheel head 13. Theseprojections 104 are provided near their outer ends with Vslots 105 inwhich the bar 100 is adapted to rest. The collar 103 rests against oneside of one of the projections 1071 and serves to hold the bar 100 inposition.

The arm 102 is provided at its outer or Jfree end with an adjustingscrew 110 having at one end a kuurled head 112 on which graduations 1,13are provided. The graduations 113 in connection with a scale 114 securedto the arm 102 determine the adjustH ment oi screw 110.

Inserted in the forward end of the screw 110 is the dressing tool. This,in the form shown, comprises a diamond 117 set centrally andlongitudinally in a small sleeve 116 as shown.

IVith the attachment in position as shown il is onlyv necessary torotate the knurled head 112 of screw 110 until the diamond 11T is incontact with the wheel 10. As soon as this takes place the arm 102 maybe oscillated about the. axis of the bar 100 which is parallel to theaxis of the wheel. 10 so that the diamond 117 may traverse the workengaging lateral surface of the wheel.

Vo frirtionally hold lthe screw 110 in any adjusted position a smallshoe 120 is pro vided in the arm 102 pressed against the sido of screw110 by means of a light spring 121.

p is accurate up tothe outer periphery of the wheel, and, also, theouter periphery may be dressedto a predetermined size.

What I claim 1s: c

y1. A dressing attachment for abrasive wheels comprising in combination,a sleeve adapted to fit into a portion of the wheel.

mounting, a rod within said sleeve, means: to adjust said rod relativeto said sleeve, and a dressing 'tool mounted eccentrically on said rod,whereby oscillation of said rod will traverse said dressing tool acrossa surface of said abrasive wheel.

2; A dressing attachment for abrasive wheels comprising(v incombination, a sleeve adapted to it into a'portion of the wheelmounting, a rod within said sleeve, means to adjust said rodlongitudinally relative to said sleeve, and a :dressing tool mountedeccentrically on said rod, whereby oscillation of said rod 'willtraverse said dressingtool across a surface of said `abrasive wheel.

3. A dressing attachment 4for abrasive wheels comprising in combination,a sleeve adapted to lit into a portion of the wheel mounting, a rodwithin said sleeve, means to adjust said rod relative to said sleeve,and a dressing tool mounted eccentrically at one end of said rod,whereby oscillation of said rod will traverse said dressing tool acrossa surface of said abrasive wheel.

4. A dressing attachment for abrasive wheels comprising in combination,a sleeve adapted to tit into a portion of fthe wheel mounting, a rodwithin said sleeve, means to adjust said rod to a predetermined positionrelative to said sleeve, and a dressing tool mounted eccentrically onsaid rod, whereby oscillation of said rod will transverse said dressingtool across a surface of said abrasive wheel. y

5. A dressing attachment for abrasive wheels comprising in combination,a sleeve adapted to fit into a portion of the wheel mounting, a rodwithin said sleeve, means to longitudinally adjust said rod to apredetermined position re ative to said sleeve, and a dresing toolmounted eccentrically at one end of said rod, whereby oscillation ofsaid rod will traverse said dressin toolacross a surface of saidabrasive whee 6. A grinding machine comprising in com bination, a wheelmounting, an abrasive wheel rotatably mounted therein, ,and a dressingattachment for said wheel, said dressin attachment comprising a sleeveadapte to be attached to said wheelmounting, a rod movable axiallytherein and a dressing tool on said rod, whereby oscillation of said rodwill traverse said dressing tool across a surface of said abrasive wheelin different adjusted positions. v

7. A grinding machine comprising in combination, a wheel mounting, anabrasive wheel rotatably mounted therein and a dressing attachment forsaid wheel, said dressin attachment comprisin a sleeve adapted rto beattached in a pre etermined adjusted position to said wheel mounting, arod therein and,a dressing tool on said rod,

whereby oscillation of said rod will traverse said dressing tool acrossa surface of said abrasive wheel.

8. A grinding machine comprising in combination, a wheel mounting, anabrasive wheel rotatably mounted therein, and a dressing' attachment forsaid wheel, said dressing attachment comprising a sleeve adapted to beattached to said wheel mounting, a rod therein, means to adjust said rodaxially relative to said sleeve, and a dressin tool lon said rod,whereby oscillation of said rod will traverse said dressino` tool acrossa surface of said abrasive wheel.

9. A grinding machine comprising in combination, a wheel mounting, anabrasive wheel rotatably mounted therein, and a dressing attachment forsaid wheel, said dressin attachment comprising a sleeve adapte to beattached in a predetermined adjusted position to said wheel mounting, arod therein, means to adjust said rod relative to said sleeve, andadressing tool on said rod, whereby oscillation of said rod will traversesaid dressing tool across a surface of said abrasive wheel.

10. A grinding machine comprising in combination, a wheel mounting, anabrasive wheel rotatably mounted therein, and a dressing attachment forsaid wheel, said dressin attachment comprising a` sleeve adapte to beattached in a predetermined adjusted position to said wheel mounting, arod therein and a dressing tool mounted eccentrically on one end of saidrod, whereby oscillation `of said rod will traverse said dressing toolacross the surface of said abrasive wheel.

In testimony whereof, I hereto aiix; my

signature.

CARROLL KNOWLES.

ico

